CN112505270A - Optimization method for improving dissolved oxygen in stagnant temperature layer of reservoir - Google Patents

Optimization method for improving dissolved oxygen in stagnant temperature layer of reservoir Download PDF

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CN112505270A
CN112505270A CN202011148417.4A CN202011148417A CN112505270A CN 112505270 A CN112505270 A CN 112505270A CN 202011148417 A CN202011148417 A CN 202011148417A CN 112505270 A CN112505270 A CN 112505270A
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余晓
李倩
葛德祥
诸葛亦斯
徐静
刘晓波
杜强
谭红武
李国强
石浩洋
聂睿
李双双
梁晓旭
陈一迪
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Environmental Engineering Evaluation Center Of Ministry Of Ecology And Environment
China Institute of Water Resources and Hydropower Research
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Abstract

The invention discloses an optimization method for improving dissolved oxygen in a temperature stagnation layer of a reservoir, which comprises the following steps: and (3) constructing a hydrodynamic-water quality model of the reservoir, simulating the change characteristics of dissolved oxygen of the reservoir, analyzing the influence rule of the three factors on the dissolved oxygen concentration by taking the adjustment amount, the water level and the nitrate concentration as influence factors, and giving a suggestion of optimizing the dissolved oxygen concentration of the temperature stagnation layer. The reservoir can increase the vertical disturbance of the water body and increase the supply of the dissolved oxygen at the bottom through water supply scheduling and pumped storage scheduling as much as possible; the reservoir keeps high water level operation of the reservoir at the initial stage and the middle stage of thermal stratification to reduce the oxygen consumption rate of the temperature stagnation layer, and the reservoir reduces the operation water level of the reservoir as much as possible at the final stage of the thermal stratification to shorten the duration of the thermal stratification; in a reservoir with serious sediment pollution, a certain nitrate concentration is kept, and the consumption of dissolved oxygen in a temperature stagnation layer is effectively relieved.

Description

Optimization method for improving dissolved oxygen in stagnant temperature layer of reservoir
Technical Field
The invention relates to the technical field of reservoir dissolved oxygen optimization, in particular to an optimization method for improving dissolved oxygen in a reservoir temperature stagnation layer.
Background
The dissolved oxygen concentration of the reservoir temperature stagnation layer controls the release amount of endogenous pollution such as nitrogen, phosphorus and the like of the reservoir, influences the water quality of the reservoir, and the key for guaranteeing the water quality of the reservoir is to improve the oxygen deficiency of the temperature stagnation layer. The evolution of reservoir dissolved oxygen is mainly controlled by hydrodynamic force, thermal stratification and biochemical processes, and changes of reservoir water level, reservoir scheduling, nitrate concentration and the like in actual reservoir management are main factors causing changes of reservoir hydrodynamic force, thermal stratification and biochemical processes. The method for solving the problems has important significance in improving the water quality of the thermal stratification reservoir and guaranteeing the water supply safety.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an optimization method of dissolved oxygen in a stagnant temperature layer of a reservoir with obvious effect.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the optimization method for improving the dissolved oxygen in the stagnant temperature layer of the reservoir comprises the following steps:
s1: constructing a hydrodynamic-water quality model of the reservoir, wherein the hydrodynamic-water quality model comprises a hydrodynamic basic control equation, a heat exchange reaction equation and a water quality reaction equation, and calculating the hydrodynamic-water quality model by utilizing a hydrodynamic, water temperature and ECOlab module of MIKE 3 software to simulate the change characteristics of dissolved oxygen in the next step;
s2: taking the maximum dispatching quantity and the minimum dispatching quantity in a set year section of the reservoir as variables, and respectively inputting the variables into a reservoir dissolved oxygen simulation model to respectively obtain a dissolved oxygen concentration vertical distribution diagram under the conditions of the maximum dispatching quantity and the minimum dispatching quantity;
s3: respectively comparing the temperature-stagnation layer dissolved oxygen concentrations under the conditions of the maximum scheduling amount and the minimum scheduling amount;
s4: if the concentration of the dissolved oxygen in the stagnant temperature layer under the condition of the maximum scheduling amount is greater than that of the dissolved oxygen in the stagnant temperature layer under the condition of the minimum scheduling amount, the fact that the vertical disturbance of the water body is increased by the scheduling water is proved, the oxygen deficiency of the stagnant temperature layer is restrained, and the dissolved oxygen in the stagnant temperature layer of the reservoir is optimized by increasing the scheduling amount of the reservoir water;
s5: otherwise, the scheduling amount of reservoir water is reduced;
s6: taking the low water level and the high water level of the reservoir in a set year section as variables, and respectively inputting the low water level and the high water level into a reservoir dissolved oxygen simulation model to obtain dissolved oxygen concentration vertical distribution graphs under two water level conditions, wherein the high water level and the low water level are respectively the highest water level and the lowest water level of the reservoir in the set year section;
s7: comparing the dissolved oxygen concentrations under the two water level conditions, and if the dissolved oxygen concentration of the temperature stagnation layer under the high water level condition is the highest, maintaining the high water level of the reservoir to optimize the dissolved oxygen in the temperature stagnation layer;
s8: if the concentration of dissolved oxygen in the temperature stagnation layer is highest under the low water level condition, the reservoir should keep the low water level all the year round to optimize the dissolved oxygen in the temperature stagnation layer;
s9: taking the nitrate exceeding concentration and the nitrate concentration of which the water quality reaches the standard in the current stage of the reservoir as variables, and respectively substituting the variables into a reservoir dissolved oxygen simulation model to obtain a dissolved oxygen concentration vertical distribution diagram under the condition of two nitrate concentrations, wherein the nitrate exceeding concentration in the current stage is the average value of the actually measured nitrate concentration in a set year period, the nitrate concentration of which the water quality reaches the standard is the nitrate concentration of which the TN reaches the standard, and the nitrate exceeding concentration in the current stage is higher than the nitrate concentration of which the water quality reaches the standard;
s10: and comparing the dissolved oxygen concentrations under the two nitrate concentration conditions, if the dissolved oxygen concentration of the temperature-stagnation layer under the condition of the standard exceeding concentration of the nitrate at the present stage is greater than the dissolved oxygen concentration of the temperature-stagnation layer under the condition of the nitrate concentration, increasing the input of the upstream nitrate to relieve the oxygen deficiency at the bottom of the temperature-stagnation layer of the reservoir, and otherwise, reducing the input of the upstream nitrate.
The invention has the beneficial effects that: according to the scheme, the concentration of dissolved oxygen in the temperature stagnation layer of the reservoir is analyzed from three directions of reservoir water quantity scheduling, reservoir water level height and concentration of nitrate in the reservoir water, and a countermeasure proposal for improving the dissolved oxygen in the temperature stagnation layer of the reservoir is provided. The reservoir increases the vertical disturbance of the water body and increases the supply of dissolved oxygen at the bottom as far as possible through water supply scheduling and pumped storage scheduling, the reservoir keeps the high water level operation of the reservoir to reduce the oxygen consumption rate of the temperature stagnation layer, and the reservoir reduces the water level operation of the reservoir as far as possible to shorten the duration of thermal stratification.
The scheme simulates the hydrodynamic force, thermal stratification and water quality change process of the reservoir by constructing a hydrodynamic force-water quality model of the reservoir. The evolution process of the dissolved oxygen in the reservoir is simulated by fully considering biochemical reaction processes such as supply, consumption, buffering and the like of the dissolution, the simulation precision is higher, and the structure and the change process of the true dissolved oxygen in the reservoir can be well reproduced.
The actual operation condition of the reservoir and the water supply safety guarantee are comprehensively considered, the measures of optimizing conventional water dispatching, controlling the concentration of the nitrate in the reservoir and the like to improve the dissolved oxygen in the stagnant temperature layer of the reservoir are formulated, and the good prevention and control effect is achieved on the oxygen deficiency in the stagnant temperature layer of the reservoir.
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FIG. 1 is a flow chart of an optimization method for improving dissolved oxygen in a stagnant temperature layer of a reservoir.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the optimization method for improving dissolved oxygen in the stagnant temperature layer of the reservoir provided by the scheme comprises the following steps:
s1: constructing a hydrodynamic-water quality model of the reservoir, wherein the hydrodynamic-water quality model comprises a hydrodynamic basic control equation, a heat exchange reaction equation and a water quality reaction equation, and calculating the hydrodynamic-water quality model by utilizing a hydrodynamic, water temperature and ECOlab module of MIKE 3 software to simulate the change characteristics of dissolved oxygen in the next step;
the basic control equation of hydrodynamic force is as follows:
Figure BDA0002740435630000041
Figure BDA0002740435630000042
Figure BDA0002740435630000043
where t is time, ρ is density of water, ui、ujAre respectively xi、xiComponent of velocity in the direction, csIs the propagation velocity of sound in water, P is pressure, omegaijIs Cochler's syndromeTensor, AgiIs a gravity vector, vTFor the turbulent viscosity coefficient, δijIs a function of Kronecker, k is the turbulent kinetic energy, T is the temperature, DTSS is the respective source-sink term for the temperature diffusion coefficient.
The heat exchange reaction equation is:
Δq＝qlr，net+qsr，net-qv-qc
wherein, Deltaq is the total heat exchange amount of the water surface, qlr,netAs net short wave radiation, qsr,netIs the net long wave radiation of the water surface; q. q.svThe heat loss is the evaporation heat loss; q. q.scThe heat transfer between the atmosphere and the water surface.
The water quality reaction equation is as follows:
Figure BDA0002740435630000044
wherein C is the concentration of the substance; u, v, w are flow velocities in x, y, z directions, respectively, Dx、DyAnd DzDiffusion coefficients in x, y and z directions, ScAs a source or sink item, PcThe biochemical reaction for influencing the concentration of the water body substances.
S2: the maximum dispatching quantity and the minimum dispatching quantity in one year in the set year section of the water intake reservoir are taken as variables, the embodiment takes a Panjiakou reservoir as an example, the Panjiakou reservoir is 2014-2018, the maximum dispatching quantity is 11.27 hundred million m of pumped water in 20183The conventional amount of discharged water is 13.1 hundred million m3(ii) a The minimum regulating quantity is the situation of closing pumped storage dispatching in 2017, and the conventional drainage quantity is 3.2 hundred million m3I.e. the annual adjustment amount is zero. The regulation quantity of the reservoir is the sum of the pumping storage quantity and the discharge quantity under the conventional discharge.
Inputting the maximum dispatching quantity and the minimum dispatching quantity into a reservoir dissolved oxygen simulation model respectively to obtain dissolved oxygen concentration vertical distribution graphs under the conditions of the maximum dispatching quantity and the minimum dispatching quantity respectively,
s3: respectively comparing the temperature-stagnation layer dissolved oxygen concentrations under the conditions of the maximum scheduling amount and the minimum scheduling amount;
s4: if the concentration of the dissolved oxygen in the stagnant temperature layer under the condition of the maximum scheduling amount is greater than that of the dissolved oxygen in the stagnant temperature layer under the condition of the minimum scheduling amount, the fact that the vertical disturbance of the water body is increased by the scheduling water is proved, the oxygen deficiency of the stagnant temperature layer is restrained, and the dissolved oxygen in the stagnant temperature layer of the reservoir is optimized by increasing the scheduling amount of the reservoir water;
s5: otherwise, the scheduling amount of reservoir water is reduced;
according to the dissolved oxygen concentration vertical distribution diagram, a dissolved oxygen concentration characteristic table under different scheduling quantity conditions is listed, as shown in the following table 1, the maximum scheduling quantity corresponds to a working condition 1, the minimum scheduling quantity corresponds to a working condition 2, and different working conditions correspond to the dissolved oxygen characteristic indexes at the bottom of the temperature stagnation layer.
TABLE 1
Figure BDA0002740435630000051
According to the analysis of table 1 above, the effect of the storage without pumped water on the dissolved oxygen concentration of the stratosphere increases significantly over time. Under the condition of no pumped storage dispatching, severe oxygen deficiency exists under all conditions, wherein the oxygen deficiency time of the small water quantity and no pumped storage dispatching condition corresponding to the working condition is longest.
Therefore, through the effect of pumping and discharging large water amount, the vertical disturbance of the water body is increased, the reservoir overturning time is advanced, and the temperature-stagnation layer oxygen deficiency can be inhibited to a greater extent. If the function of water pumping and energy storage is not available, the duration of oxygen deficiency at the bottom of the temperature stagnation layer of the reservoir is multiplied, and the severity of the oxygen deficiency is increased.
S6: the low water level and the high water level of the reservoir in a set year period are taken as variables, the low water level and the high water level are respectively input into a reservoir dissolved oxygen simulation model, and vertical distribution graphs of the dissolved oxygen concentration under two water level conditions are obtained, wherein a working condition 3 corresponds to the high water level, and a working condition 4 corresponds to the low water level, as shown in table 1.
S7: comparing the dissolved oxygen concentrations under the two water level conditions, and if the dissolved oxygen concentration of the temperature stagnation layer under the high water level condition is the highest, maintaining the high water level of the reservoir to optimize the dissolved oxygen in the temperature stagnation layer;
s8: if the stagnant temperature layer dissolved oxygen concentration is highest under the low water level condition, the reservoir should keep the low water level all the year round to optimize the dissolved oxygen in the stagnant temperature layer.
The method takes 2017 as a reference, the reservoir operates at a high water level in 2017, the annual average water level is 216m, and the annual water discharge amount is small and is only 3.2 hundred million m3Therefore, 2017 was set as the representative year of the high water level, low water volume letdown scenario. According to actual scheduling and operating data of the reservoir in 2005-2018, the representative year of the situation of low water level and small water amount drainage in 2017 compared with 2005 is taken as the year, the annual average water level of the reservoir in 2005 is 199m, and the conventional drainage amount is 3.6 hundred million m3。
A dissolved oxygen profile was obtained from the vertical profiles of dissolved oxygen concentration at the two water levels, as shown in table 1 above.
The analysis of the duration of the severe hypoxia of the temperature stagnation layers with different water levels shows that the duration of the severe hypoxia of the low water level operation of the reservoir is longer and the hypoxia is more severe. The lower the water level of the Panjiakou reservoir, the lower the dissolved oxygen concentration of the hypothermia layer is, but the hypoxia degree at the bottom of the hypothermia layer is increased by low-water-level operation.
S9: taking the nitrate exceeding concentration and the nitrate concentration of which the water quality reaches the standard in the current stage of the reservoir as variables, and respectively substituting the variables into a reservoir dissolved oxygen simulation model to obtain a dissolved oxygen concentration vertical distribution diagram under the condition of two nitrate concentrations, wherein the nitrate exceeding concentration in the current stage is the average value of the actually measured nitrate concentrations in a set year period, the nitrate concentration of which the water quality reaches the standard is the nitrate concentration of which the TN reaches the standard, and the nitrate exceeding concentration in the current stage is higher than the nitrate concentration of which the water quality reaches the standard. In the current situation, the concentration of nitrate in the water area and the reservoir area is set to be 4mg/L by referring to the actually measured concentration of the nitrate in the water area and the reservoir area of the Panjiakou reservoir; the standard reaching situation considers the standard reaching requirement of reservoir TN, and the initial nitrate concentration of both water and reservoir area is set to be 0.6 mg/L.
S10: and comparing the dissolved oxygen concentrations under the two nitrate concentration conditions, if the dissolved oxygen concentration of the temperature-stagnation layer under the nitrate concentration condition at the current stage is greater than the dissolved oxygen concentration of the temperature-stagnation layer under the standard nitrate concentration condition, increasing the input of the upstream nitrate to relieve the hypoxia at the bottom of the temperature-stagnation layer of the reservoir, and otherwise, reducing the input of the upstream nitrate.
According to the vertical distribution diagram of the dissolved oxygen concentration under the condition of two nitrate concentrations, the dissolved oxygen concentration under the condition of standard nitrate concentration is listed as shown in table 1, the working condition 5 corresponds to the high concentration of the nitrate at the current stage, and the working condition 6 corresponds to the low concentration of the nitrate with the water quality reaching the standard. Comparing and analyzing the table 1, under the action of the current sediment oxygen consumption, the concentration of the reservoir nitrate is reduced to reach the standard level, the duration time of oxygen deficiency and severe oxygen deficiency at the bottom of the temperature stagnation layer is greatly increased, and the severe oxygen deficiency time of each working condition is averagely increased.
Under the current situation of Panjiakou reservoir, the sediments are seriously polluted organically, the oxygen consumption of the sediments is large, and the buffering action of the denitrification reaction of the nitrates at the bottom of the isothermal layer on the dissolved oxygen is very important for keeping the aerobic state at the bottom of the isothermal layer. Under the current sediment pollution state, the great reduction of the nitrate of the reservoir can lead to the doubling increase of the duration of the anoxic of the temperature stagnation layer during the thermal stratification, and the serious degree of the anoxic is obviously aggravated.
According to the scheme, the oxygen concentration in the temperature stagnation layer of the reservoir is analyzed from three directions of reservoir water quantity scheduling, reservoir water level height and nitrate concentration in the reservoir water, and a countermeasure proposal for improving dissolved oxygen in the temperature stagnation layer of the reservoir is provided.
The reservoir can increase the vertical disturbance of the water body and increase the supply of the dissolved oxygen at the bottom through water supply scheduling and pumped storage scheduling as much as possible; the reservoir keeps high water level operation of the reservoir at the initial stage and the middle stage of thermal stratification to reduce the oxygen consumption rate of the temperature stagnation layer, and the reservoir reduces the operation water level of the reservoir as much as possible at the final stage of the thermal stratification to shorten the duration of the thermal stratification; in a reservoir with serious sediment pollution, a certain nitrate concentration is kept to improve the water body and effectively relieve the consumption of dissolved oxygen in a temperature stagnation layer.
The scheme simulates the hydrodynamic force, thermal stratification and water quality change process of the reservoir by constructing a hydrodynamic force-water quality model of the reservoir. The evolution process of the dissolved oxygen in the reservoir is simulated by fully considering biochemical reaction processes such as supply, consumption, buffering and the like of the dissolution, the simulation precision is higher, and the structure and the change process of the true dissolved oxygen in the reservoir can be well reproduced.
The actual operation condition of the reservoir and the water supply safety guarantee are comprehensively considered, the measures of optimizing conventional water dispatching, controlling the concentration of the nitrate in the reservoir and the like to improve the dissolved oxygen in the stagnant temperature layer of the reservoir are formulated, and the good prevention and control effect is achieved on the oxygen deficiency in the stagnant temperature layer of the reservoir.

Claims (5)

1. An optimization method for improving dissolved oxygen in a temperature stagnation layer of a reservoir is characterized by comprising the following steps:
s1: constructing a hydrodynamic-water quality model of the reservoir, wherein the hydrodynamic-water quality model comprises a hydrodynamic basic control equation, a heat exchange reaction equation and a water quality reaction equation, and calculating the hydrodynamic-water quality model by utilizing a hydrodynamic, water temperature and ECOlab module of MIKE 3 software to simulate the change characteristics of dissolved oxygen in the next step;
s2: taking the maximum dispatching quantity and the minimum dispatching quantity in a set year section of the reservoir as variables, and respectively inputting the variables into a reservoir dissolved oxygen simulation model to respectively obtain a dissolved oxygen concentration vertical distribution diagram under the conditions of the maximum dispatching quantity and the minimum dispatching quantity;
s3: respectively comparing the temperature-stagnation layer dissolved oxygen concentrations under the conditions of the maximum scheduling amount and the minimum scheduling amount;
s4: if the concentration of the dissolved oxygen in the stagnant temperature layer under the condition of the maximum scheduling amount is greater than that of the dissolved oxygen in the stagnant temperature layer under the condition of the minimum scheduling amount, the fact that the vertical disturbance of the water body is increased by the scheduling water is proved, the oxygen deficiency of the stagnant temperature layer is restrained, and the dissolved oxygen in the stagnant temperature layer of the reservoir is optimized by increasing the scheduling amount of the reservoir water;
s5: otherwise, the scheduling amount of reservoir water is reduced;
s6: taking the low water level and the high water level of the reservoir in a set year section as variables, and respectively inputting the low water level and the high water level into a reservoir dissolved oxygen simulation model to obtain dissolved oxygen concentration vertical distribution graphs under two water level conditions, wherein the high water level and the low water level are respectively the highest water level and the lowest water level of the reservoir in the set year section;
s7: comparing the dissolved oxygen concentrations under the two water level conditions, and if the dissolved oxygen concentration of the temperature stagnation layer under the high water level condition is the highest, maintaining the high water level of the reservoir to optimize the dissolved oxygen in the temperature stagnation layer;
s8: if the concentration of dissolved oxygen in the temperature stagnation layer is highest under the low water level condition, the reservoir should keep the low water level all the year round to optimize the dissolved oxygen in the temperature stagnation layer;
s9: taking the nitrate exceeding concentration and the nitrate concentration of which the water quality reaches the standard in the current stage of the reservoir as variables, and respectively substituting the variables into a reservoir dissolved oxygen simulation model to obtain a dissolved oxygen concentration vertical distribution diagram under the condition of two nitrate concentrations, wherein the nitrate exceeding concentration in the current stage is the average value of the actually measured nitrate concentration in a set year period, the nitrate concentration of which the water quality reaches the standard is the nitrate concentration of which the TN reaches the standard, and the nitrate exceeding concentration in the current stage is higher than the nitrate concentration of which the water quality reaches the standard;
s10: and comparing the dissolved oxygen concentrations under the two nitrate concentration conditions, if the dissolved oxygen concentration of the temperature-stagnation layer under the condition of the standard exceeding concentration of the nitrate at the present stage is greater than the dissolved oxygen concentration of the temperature-stagnation layer under the condition of the nitrate concentration, increasing the input of the upstream nitrate to relieve the oxygen deficiency at the bottom of the temperature-stagnation layer of the reservoir, and otherwise, reducing the input of the upstream nitrate.
2. The optimization method for improving dissolved oxygen in the stagnant temperature layer of a reservoir according to claim 1, wherein the hydrodynamic basic control equation is as follows:
Figure FDA0002740435620000021
Figure FDA0002740435620000022
Figure FDA0002740435620000023
where t is time, ρ is density of water, ui、ujAre respectively xi、xiComponent of velocity in the direction, csIs the propagation velocity of sound in water, P is pressure, omegaijIs the Copenz tensoriIs a gravity vector, vTFor the turbulent viscosity coefficient, δijIs a function of Kronecker, and k is the turbulenceCan, T is temperature, DTSS is the respective source-sink term for the temperature diffusion coefficient.
3. The optimization method for improving dissolved oxygen in the stagnant temperature layer of a reservoir according to claim 1, wherein the heat exchange reaction equation is as follows:
Δq＝qlr，net+qsr，net-qv-qc
wherein, Deltaq is the total heat exchange amount of the water surface, qlr,netAs net short wave radiation, qsr,netIs the net long wave radiation of the water surface; q. q.svThe heat loss is the evaporation heat loss; q. q.scThe heat transfer between the atmosphere and the water surface.
4. The optimization method for improving dissolved oxygen in the stagnant temperature layer of the reservoir according to claim 1, wherein the water quality reaction equation is as follows:
Figure FDA0002740435620000031
wherein C is the concentration of the substance; u, v, w are flow velocities in x, y, z directions, respectively, Dx、DyAnd DzDiffusion coefficients in x, y and z directions, ScAs a source or sink item, PcThe biochemical reaction for influencing the concentration of the water body substances.
5. The optimized method for improving dissolved oxygen in the stratosphere of the reservoir as claimed in claim 1, wherein said step S2 comprises:
s21: the water power module, the water temperature module and the ECOlab module of the MIKE 3 software are used for dispersing the water power-water quality model:
s22: scanning the dispersed hydrodynamic-water quality model line by line, and then scanning the dispersed hydrodynamic-water quality model line by line;
s23: repeating the step S22 to form a round of iteration;
s24: and solving the algebraic equation set of each row and each column, and solving the solved algebraic equation set by adopting a three-diagonal matrix calculation formula to obtain the reservoir dissolved oxygen simulation model.
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CN114662422A (en) * 2022-04-02 2022-06-24 中国水利水电科学研究院 Construction method of thermal stratification reservoir thermocline dissolved oxygen prediction model
CN117172162A (en) * 2023-11-03 2023-12-05 长江三峡集团实业发展(北京)有限公司 Simulation method and device for saline solution migration process in seawater migration process
CN117172162B (en) * 2023-11-03 2024-01-26 长江三峡集团实业发展(北京)有限公司 Simulation method and device for saline solution migration process in seawater migration process

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